QIconEngine

The QIconEngine class provides an abstract base class for QIcon renderers. More

Inheritance diagram of PySide2.QtGui.QIconEngine

Synopsis

Functions

Virtual functions

Detailed Description

An icon engine provides the rendering functions for a QIcon . Each icon has a corresponding icon engine that is responsible for drawing the icon with a requested size, mode and state.

The icon is rendered by the paint() function, and the icon can additionally be obtained as a pixmap with the pixmap() function (the default implementation simply uses paint() to achieve this). The addPixmap() function can be used to add new pixmaps to the icon engine, and is used by QIcon to add specialized custom pixmaps.

The paint() , pixmap() , and addPixmap() functions are all virtual, and can therefore be reimplemented in subclasses of QIconEngine .

See also

QIconEnginePlugin

class PySide2.QtGui.QIconEngine

PySide2.QtGui.QIconEngine(other)

param other

PySide2.QtGui.QIconEngine

Constructs the icon engine.

PySide2.QtGui.QIconEngine.IconEngineHook

These enum values are used for virtual_hook() to allow additional queries to icon engine without breaking binary compatibility.

Constant

Description

QIconEngine.AvailableSizesHook

Allows to query the sizes of the contained pixmaps for pixmap-based engines. The data argument of the virtual_hook() function is a AvailableSizesArgument pointer that should be filled with icon sizes. Engines that work in terms of a scalable, vectorial format normally return an empty list.

QIconEngine.IconNameHook

Allows to query the name used to create the icon, for example when instantiating an icon using fromTheme() .

QIconEngine.IsNullHook

Allow to query if this engine represents a null icon. The data argument of the virtual_hook() is a pointer to a bool that can be set to true if the icon is null. This enum value was added in Qt 5.7.

QIconEngine.ScaledPixmapHook

Provides a way to get a pixmap that is scaled according to the given scale (typically equal to the device pixel ratio). The data argument of the virtual_hook() function is a ScaledPixmapArgument pointer that contains both the input and output arguments. This enum value was added in Qt 5.9.

See also

virtual_hook()

PySide2.QtGui.QIconEngine.actualSize(size, mode, state)
Parameters
Return type

PySide2.QtCore.QSize

Returns the actual size of the icon the engine provides for the requested size , mode and state . The default implementation returns the given size .

PySide2.QtGui.QIconEngine.addFile(fileName, size, mode, state)
Parameters

Called by addFile() . Adds a specialized pixmap from the file with the given fileName , size , mode and state . The default pixmap-based engine stores any supplied file names, and it loads the pixmaps on demand instead of using scaled pixmaps if the size of a pixmap matches the size of icon requested. Custom icon engines that implement scalable vector formats are free to ignores any extra files.

PySide2.QtGui.QIconEngine.addPixmap(pixmap, mode, state)
Parameters

Called by addPixmap() . Adds a specialized pixmap for the given mode and state . The default pixmap-based engine stores any supplied pixmaps, and it uses them instead of scaled pixmaps if the size of a pixmap matches the size of icon requested. Custom icon engines that implement scalable vector formats are free to ignores any extra pixmaps.

PySide2.QtGui.QIconEngine.availableSizes([mode=QIcon.Normal[, state=QIcon.Off]])
Parameters
Return type

Returns sizes of all images that are contained in the engine for the specific mode and state .

Note

This is a helper method and the actual work is done by the virtual_hook() method, hence this method depends on icon engine support and may not work with all icon engines.

PySide2.QtGui.QIconEngine.clone()
Return type

PySide2.QtGui.QIconEngine

Reimplement this method to return a clone of this icon engine.

PySide2.QtGui.QIconEngine.iconName()
Return type

str

Returns the name used to create the engine, if available.

Note

This is a helper method and the actual work is done by the virtual_hook() method, hence this method depends on icon engine support and may not work with all icon engines.

PySide2.QtGui.QIconEngine.isNull()
Return type

bool

Returns true if this icon engine represent a null QIcon .

Note

This is a helper method and the actual work is done by the virtual_hook() method, hence this method depends on icon engine support and may not work with all icon engines.

PySide2.QtGui.QIconEngine.key()
Return type

str

Returns a key that identifies this icon engine.

PySide2.QtGui.QIconEngine.paint(painter, rect, mode, state)
Parameters

Uses the given painter to paint the icon with the required mode and state into the rectangle rect .

PySide2.QtGui.QIconEngine.pixmap(size, mode, state)
Parameters
Return type

PySide2.QtGui.QPixmap

Returns the icon as a pixmap with the required size , mode , and state . The default implementation creates a new pixmap and calls paint() to fill it.

PySide2.QtGui.QIconEngine.read(in)
Parameters

inPySide2.QtCore.QDataStream

Return type

bool

Reads icon engine contents from the QDataStream in . Returns true if the contents were read; otherwise returns false .

QIconEngine ‘s default implementation always return false.

PySide2.QtGui.QIconEngine.scaledPixmap(size, mode, state, scale)
Parameters
Return type

PySide2.QtGui.QPixmap

Returns a pixmap for the given size , mode , state and scale .

The scale argument is typically equal to the device pixel ratio of the display.

Note

This is a helper method and the actual work is done by the virtual_hook() method, hence this method depends on icon engine support and may not work with all icon engines.

Note

Some engines may cast scale to an integer.

See also

ScaledPixmapArgument

PySide2.QtGui.QIconEngine.write(out)
Parameters

outPySide2.QtCore.QDataStream

Return type

bool

Writes the contents of this engine to the QDataStream out . Returns true if the contents were written; otherwise returns false .

QIconEngine ‘s default implementation always return false.